Re: VS vs. P14 (was Re: Indic Devanagari Query)

From: Asmus Freytag (
Date: Wed Feb 05 2003 - 14:35:26 EST

  • Next message: "Re: VS vs. P14 (was Re: Indic Devanagari Query)"

    At 06:24 PM 2/5/03 +0000, wrote:
    >The advantages of using P14 tags (...equals lang IDs mark-up) is
    >that runs of text could be tagged *in a standard fashion* and
    >preserved in plain-text.

    The minute you have scoped tagging, you are no longer using
    plain text.

    The P14 tags are no different than HTML markup in that regard,
    however, unlike HTML markup they can be filtered out by a
    process that does not implement them. (In order to filter
    out HTML, you need to know the HTML syntax rules. In order
    to filter out P14 tags you only need to know their code point

    Variation selectors also can be ignored based on their code
    point values, but unlike p14 tags, they don't become invalid
    when text is cut&paste from the middle of a string.

    If 'unaware' applications treat them like unknown combining
    marks and keep them with the base character like they would
    any other combining mark during editing, then variation
    selectors have a good chance surviving in plain text.

    P14 tags do not.

    Unicode 4.0 will be quite specific: P14 tags are "reserved for
    use with particular protocols requiring their use" is what the
    text will say more or less.


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